Whose ping pong bat is this– I’m not sure. I think it ______be Tom’s.

Tom is a promising student. I am sure that withhis________effort, he will make a very successful scientist.

To my surprise, I never thought I ______ those kinds of books.[ ]

Those who are not _______ with the progress they have made will work harder.

Do you like the material?–Yes, it ___________ very soft.